Is There Any Cold Water Fish That Would Live In A 4 Us Gal

[MrNiceGuy]

just measured its actually 5 gallons

i forgot to mention id like to feed flake and frozen as a treat occasionally

what about paradise fish?

a paradise fish would be nice. 4 inch depth would be a little tight though as they can get up to 3.5 inches. where did that tank come from? ive never heard of such a tank